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  • 0 (xsd:integer)
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  • 609 (xsd:integer)
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  • We used the following data sources for county-level sociodemographic characteristics, and for cross-county migration: (1) proportion of population by race and urban/rural place of residence, US Census via American FactFinder (http://factfinder.census.gov/) (for the 1990 and 2000 censuses) and via the Inter-University Consortium for Political and Social Research (ICPSR) (http://www.icpsr.umich.edu) (for the 1960, 1970, and 1980 censuses); (2) education, US Census via the National Historical Geographic Information System (http://www.nhgis.org/) (1970 and 1980) and via American FactFinder (1990 and 2000).
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